<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>签名档</title>
    <style>
      input {
        width: 100px;
        border: 0;
        border-bottom: 2px solid #000;
        outline: none;
        text-align: center;
      }
    </style>
  </head>
  <body>
    签名: <input type="text" />
  </body>
</html>
